SPAX PowerLags 4581820800905 Structural Screw, 5/16 in Thread, 3-1/2 in L, Washer Head, T-Star Drive

SPAX PowerLags offer an unparalleled level of fastening efficiency, reliability and value for structural wood assemblies. Available in two head styles, four diameters and a wide selection of lengths, you can be assured of having the right fastener for ledger boards, rim boards, post attachments and multi-ply connections.